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首页> 外文期刊>Eurasian Soil Science >Quantitative Estimate of the Heterogeneity of Solute Fluxes Using the Dispersivity Length for Mathematical Models of Pesticide Migration in Soils
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Quantitative Estimate of the Heterogeneity of Solute Fluxes Using the Dispersivity Length for Mathematical Models of Pesticide Migration in Soils

机译：使用分散性长度对土壤农药迁移数学模型的分散性长度的定量估计

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Mathematical models of solute movement in soils are used as management means for assessing the migration of agrochemicals and calculating environmental risks. In these models, the soil block includes the soil values of dispersivity length or solute diffusivity as one of the main parameters. Under laboratory conditions, this parameter was determined experimentally in soil columns by recording the dynamics of the effluent concentration and solving inverse problems. A direct experimental method of field determination based on the movement of marker solution was tested. For the prediction, risk calculation, and management of pesticide application using physically based mathematical models, the following stepwise procedure is recommended: (1) model parameterization based on experimental soil properties; (2) use of the field dispersivity length, which was 3–11 cm for the 0- to 40-cm layer, exceeded 12 cm for deeper fissured BEL and BT (40- to 60-cm) horizons with prismatic structure, and had a median value of 21 cm in layers below 60 cm in experiments on an agrosoddy-podzolic soil (Eutric Albic Glossic Retisol (Abruptic, Loamic, Aric) (WRB, 2014) from Moscow oblast.
机译：土壤中溶质运动的数学模型用作评估农用化学品迁移和计算环境风险的管理手段。在这些模型中，土块包括分散性长度的土壤值或作为主要参数之一的溶质扩散率。在实验室条件下，通过记录流出物浓度的动态和求解逆问题，在土柱中实验确定该参数。测试了基于标记溶液运动的场测定的直接实验方法。对于使用物理基础的数学模型的预测，风险计算和农药应用的管理，建议以下逐步程序：（1）基于实验土壤性质的模型参数化; （2）使用为0至40cm层为3-11厘米的场分散性长度超过12厘米，用于更深的裂缝和BT（40至60厘米）的棱柱结构，并且具有在从莫斯科州的农业统治者土壤（Eutric Alboric Retisol（突发，遗传，ARIC）（来自莫斯科州）的实验中，在60厘米以下21厘米的中位值。

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